Oracle VM VirtualBox: Ticket #12350: Hardware Virtualisation support not detected if Hyper-V installedhttps://www.virtualbox.org/ticket/12350
<p>
I get the following error (and yes I know this has been reported many times, but please read further):
VT-x/AMD-V hardware acceleration is not available on your system. Your 64-bit guest will fail to detect a 64-bit CPU and will not be able to boot.
</p>
<p>
The issue is that Virtualisation *is* enabled in my BIOS and I also made sure my BIOS is upgraded to the latest version. I also confirmed it with the Coreinfo.exe (<a class="ext-link" href="http://technet.microsoft.com/en-us/sysinternals/cc835722.aspx"><span class="icon"> </span>http://technet.microsoft.com/en-us/sysinternals/cc835722.aspx</a>) tool. Here is the ouput of that tool:
</p>
<pre class="wiki">Intel(R) Core(TM) i7-2630QM CPU @ 2.00GHz
Intel64 Family 6 Model 42 Stepping 7, GenuineIntel
HYPERVISOR * Hypervisor is present
VMX - Supports Intel hardware-assisted virtualization
EPT - Supports Intel extended page tables (SLAT)
</pre><p>
Here is the thing: I used <a class="wiki" href="https://www.virtualbox.org/wiki/VirtualBox">VirtualBox</a> on the same machine, but with Windows 7 and I could run exactly the same x64 guest images.
</p>
en-usOracle VM VirtualBox/graphics/vbox_logo2_gradient.pnghttps://www.virtualbox.org/ticket/12350
Trac 0.12mot256Tue, 12 Nov 2013 10:34:55 GMTattachment sethttps://www.virtualbox.org/ticket/12350
https://www.virtualbox.org/ticket/12350
<ul>
<li><strong>attachment</strong>
set to <em>VBox.log</em>
</li>
</ul>
<p>
Log file
</p>
TicketmhanorTue, 12 Nov 2013 11:45:32 GMThttps://www.virtualbox.org/ticket/12350#comment:1
https://www.virtualbox.org/ticket/12350#comment:1
<p>
The output of Coreinfo confirms that this is not a <a class="wiki" href="https://www.virtualbox.org/wiki/VirtualBox">VirtualBox</a> issue. VMX is not available (the "minus" sign) and that a hypervisor is already present (the asterisk sign). We can assume it's not <a class="wiki" href="https://www.virtualbox.org/wiki/VirtualBox">VirtualBox</a>'s hypervisor.<br />After enabling VT-x in the BIOS, shutdown the PC/laptop, if the BIOS doesn't do it for you. Do not use any form of standby/hibernation.
</p>
Ticketmot256Tue, 12 Nov 2013 12:00:59 GMThttps://www.virtualbox.org/ticket/12350#comment:2
https://www.virtualbox.org/ticket/12350#comment:2
<p>
I simply un-installed Hyper-V and it works again. I would like to change this to a suggestion that <a class="wiki" href="https://www.virtualbox.org/wiki/VirtualBox">VirtualBox</a> should please warn you that another virtualisation service/application is running. This will it make it so much clearer why x64 Guests would not start up.
</p>
TicketfrankWed, 13 Nov 2013 10:08:34 GMTpriority, summary changedhttps://www.virtualbox.org/ticket/12350#comment:3
https://www.virtualbox.org/ticket/12350#comment:3
<ul>
<li><strong>priority</strong>
changed from <em>blocker</em> to <em>major</em>
</li>
<li><strong>summary</strong>
changed from <em>x64 Hardware Virtualisation support not detected on Windows 8.1</em> to <em>Hardware Virtualisation support not detected if Hyper-V installed</em>
</li>
</ul>
Ticket